Discovery reports (1962) Discovery reports discoveryreports31inst Year: 1962 48 DISCOVERY REPORTS Text-fig. 28. Swimbladders of Anoplogaster longidens (a) seen from below; Melamphaes misolepis, (b) lateral view, (c) dorsal view, (d) lateral view; M. unicornis, (e) dorsal view; (f) lateral view, ft, fat investment; gg, gas-gland; ov, oval; rm, rete mirabile. (a, x 8-5; B, C, d, x 25 ; e, x 10; F, x 6.) From this dissection it would appear that in adult Anoplogaster the swimbladder can have very little hydrostatic function. Order PERCOMORPHI Family Chiasmodontidae Chiasmodon niger Johnson (
Discovery reports (1962) Discovery reports discoveryreports31inst Year: 1962 48 DISCOVERY REPORTS Text-fig. 28. Swimbladders of Anoplogaster longidens (a) seen from below; Melamphaes misolepis, (b) lateral view, (c) dorsal view, (d) lateral view; M. unicornis, (e) dorsal view; (f) lateral view, ft, fat investment; gg, gas-gland; ov, oval; rm, rete mirabile. (a, x 8-5; B, C, d, x 25 ; e, x 10; F, x 6.) From this dissection it would appear that in adult Anoplogaster the swimbladder can have very little hydrostatic function. Order PERCOMORPHI Family Chiasmodontidae Chiasmodon niger Johnson (Text-fig. 29) St. 239, 46°56'S., 46°03'W., 2. vi. 27, N 450 H, io50-i35o(-o) m. Reg. no. 1058. Standard length 50 mm. (8-o x 1-5 mm.). Position, 6° 55' N., 150 54' W., 2-m. tow-net, horizontal, 8oo(-o) m. Reg. no. 1057. Standard length 49 mm. (8-o x 1-5 mm.). Reg. no. 1-2. Madeira. Standard length 104 mm. (21-0 x 3-0 mm.). In each of the three fishes examined, the swimbladder is an elongated ellipsoidal sac, which in the 104 mm. specimen occupied the greater part of the upper half of the body-cavity. The retia are formed from an artery and vein that enter the forward tip of the sac. In the 49-mm. fish there were eight, each running backward to supply a corresponding lobe of the gas-gland and having a length of 3-25 mm. A closely similar retial measurement was also obtained from the largest individual.
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